Since aphid population may become resistant to organophosphorus compounds, avoid excessive spraying.

He used aphid fecundity data to elucidate the theoretical effects of antibiosis on insect population dynamics.

他利用蚜虫繁殖力资料说明了抗生作用对虫口动态的理论效应.

There is adequate variability in plants to breed for resistance to certain aphid vectors.

植物有充分的变异性可用于培育对一些蚜虫介体的抗性.

In general an aphid cannot or hardly identify its host at a distance.

在一定距离以外,蚜虫通常不能或难以识别其寄主植物.

Aphid count on plants in fields do not correlate with virus spread in the same fields.

田间植株蚜数与同块田内病毒的扩散程度间无相关性.

The aphid is now laying waste to the wheat and barley fields.

蚜虫正在毁掉一片片的小麦和大麦田地。

Clusters of tiny insects called aphides were to be found on the underside of the leaves.

在树叶阴面,可以发现一簇簇叫做蚜虫的小昆虫.

Huahua's family supports many aphides, which eat flowers and plants. They gather honey that aphides produce.

原来,花花家族养了很多的蚜虫, 蚜虫吃花园里的花草, 而它们收集蚜虫排出的蜜露来吃.

Sap passes right through the aphides'bodies, only getting a little thicker and sweeter.

汁液直接流过蚜虫的身体, 结果只是变得更稠、更甜.

When growing vegetables, one must guard against cabbage aphids.

菜农在种植蔬菜时一定要注意防治菜蚜.

Chrysopidae and Hemerobiidae ; larvae feed on insect pests such as aphids.

两种薄纱状翅膀的昆虫之一(蛹与褐 蛉 )其幼虫吃诸如蚜虫等的害虫.

The young beetle larvae can eat hundreds of aphids.

而幼龄瓢虫则可吃掉数百只蚜虫.

Fungal pathogens are important natural biological control agents of aphids.

病原真菌是蚜虫的重要自然控制因子.

Viruses are transmitted by VECTORS such as aphids and nematodes.

病毒的传播由传染媒介执行,例如蚜虫和线虫.

Alternation of sexual and parthenogenic generations , as in some aphids.

有性生殖和无性生殖的交替.

Certain aphids seem to prefer waxy leaves, whereas other species are repelled by them.

有些蚜虫,看来喜欢有蜡质的叶片, 而这种叶片对另一些蚜虫却有拒避作用.

Phloem elements and adjacent tissues are the principal feeding sites for most aphids.

韧皮部及其邻近组织是大多数蚜虫的主要取食部位.

However, reproduction rates of some insects such as aphids are influenced by nutrition.

然而, 一些昆虫的繁殖率,如蚜虫等是受营养影响的.

Clusters of tiny insects called aphids were to be found on the underside of the leaves.

结果在树叶背面找到成串的叫作蚜虫小虫子.

A field may be smothered with aphids.

一块田的植株可以被蚜虫盖满.

Wind has little influence on sedentary aphids.

风对不动的蚜虫很少有影响.